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 > How is this for a power system? Solar vs battery balance?

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LosAngeles

Los Angeles, CA

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Posted: 02/17/19 12:03pm Link  |  Quote  |  Print  |  Notify Moderator

some new info - I did not know that these new models existed from Trojan.

https://www.solarpowerworldonline.com/2018/10/trojan-battery-company-releasing-trillium-battery-line/

just a bit more than Battleborn, about $1,000 Trojan vs about $900 for the (i think) similar one from Battleborn.... Trojan may well be worth the extra $.

J.

jplante4

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Posted: 02/17/19 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

LosAngeles wrote:

Click



I didn't see anything about capacity in that article. Any clue?


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terryrey

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Posted: 02/17/19 03:47pm Link  |  Quote  |  Print  |  Notify Moderator

We have an Outfitter Apex 8 with the NovaKool 7.5 CF compressor fridge, two 6 Volt 230AH golf cart batteries (last summer was their 11th season and still going strong!), 375 watts solar, tv / dvd, radio, LED lighting, 1700 watt inverter, and the usual other stuff like AC, propane heat, stove, etc. We also carry a Honda 2000. The one electrical upgrade I made that really made a huge difference in keeping the camper batteries charged was installing a high amp direct charging circuit from the truck directly to the camper batteries! The factory charging circuit may deliver 10 to 12 amps - maybe, because of the small gauge wire. I use 1-0 welding cable and can deliver over 100 amps. Of course the batteries can only accept around 25 amps, but still this allows the batteries to come to a full state of charge in much less time than with the factory charge circuit. If it is sunny 5 or 6 hours a day, while parked, we never run out of battery because the solar keeps up, even with the electrical draw of the compressor fridge, furnace, etc. If it is cloudy or rainy, and we don't run the truck, but do run all of the electrical systems, including furnace (the largest single power draw), we have battery for less than two days. Since we mostly travel where it is sunny (we live in Utah) our economical Interstate battery installation along with solar and high amp charge circuit means that we don't use the generator and always have power to spare. Clouds and/or rain (no sun), however, means that we have to get the generator out by the end of day two, if we stay in one place for several days and don't drive the truck. Terry
PS. Be sure to get the aux cooling fan on your NovaKool.

terryrey

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Posted: 02/17/19 03:53pm Link  |  Quote  |  Print  |  Notify Moderator

I forgot to add that we spend 8 to 9 weeks a travel season, and have done so for the last 10 years, using the camper, tripping all over the West, so the electrical system in our Outfitter gets a good work out. Terry

DWeikert

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Posted: 02/17/19 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

jplante4 wrote:

LosAngeles wrote:

Click



I didn't see anything about capacity in that article. Any clue?


www.trojanbattery.com/trillium/

Two 12v sizes, 110 and 92 AH, and a 25 AH 24v


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dave17352

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Posted: 02/17/19 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

Those trojan Li batteries look to be superior to Battleborn. With constant 300 amp discharge and I think 100 amp charge rate. I think Battleborn are 50 amp charge rate and 100 amp discharge. That huge discharge rate could be handy with the high surge rate of the micro and the truma. I really like the battery status indicator. I wonder how that works and how accurate it is. Driving down the road with that 100 amp charge rate you would charge your batteries in no time. JMHO


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Camper_Jeff_&_Kelli

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Posted: 02/17/19 10:01pm Link  |  Quote  |  Print  |  Notify Moderator

Having recently finished a month on the road in winter conditions, I would go with a couple 170 watt Go Power or similar solar panels for a total of 340 watts with an MPPT controller. I would also have 300 AH of batteries or the most you can fit. I have 210 AH of AGM batteries effectively 105 AH battery power. Not enough for running the furnace, laptop, lighting, printer, inverter, water pump, phone charging, and other intermittent uses. The 4 gauge wire off the alternator never charges higher than about 13.7 volts. The solar charges to 14.5-6 volts on a sunny day. A lithium battery will give you better performance, more AH in a given space. Whichever battery you choose, 200 AH of usable power is the target at least for my use. I have seen the cost calculated between lithium vs AGM, lead acid and in the long run, the lithium costs less. It's that big up front cost you have to get passed.


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pianotuna

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Posted: 02/18/19 09:31am Link  |  Quote  |  Print  |  Notify Moderator

Hi,

Some exceptions to LI being the right choice. One is cold weather use. The other is Li are NOT forgiving in any sense of the word. I'd hate to ruin 200 amp-hours of LI (I think 300 would be safer). The other is connecting Li in parallel.

The Li absolutely need a battery management system. One that monitors the charge on each and every cell would be my choice.

There is one Li chemistry that can be used and charged in extreme cold, but I've not been able to find it in a high amp-hour configuration.

Camper_Jeff_&_Kelli wrote:

I have seen the cost calculated between lithium vs AGM, lead acid and in the long run, the lithium costs less. It's that big up front cost you have to get passed.


* This post was edited 02/18/19 11:08pm by pianotuna *


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

brholt

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Posted: 02/18/19 06:20pm Link  |  Quote  |  Print  |  Notify Moderator

A few thoughts.

We live in Washington and camp year round primarily on the westerm side. If you are dry camping out here in winter I don’t believe you can make a system without a generator work, especially with a compression fridge. It’s just to dark, to cloudy, and too many trees. Our experience in winter is that our solar does little or nothing.

The other thing I would worry about is the temperature limitations for charging the Lithium cells. It can get cold here especially if you have an altitude and, depending on where the batteries are located in the camper and how much heat they get, could be a big problem.

Finally, the Truma systems are pretty neat but they do seem to be slow heating. We tend to sleep with the heat turned way down under a pile of comforters. Besides liking sleeping warm with cold noses it saves a lot of propane and power. It is nice when the furnace kicks in and then heats the camper back up in the morning. The Truma may take a while to do that.

time2roll

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Posted: 02/18/19 08:06pm Link  |  Quote  |  Print  |  Notify Moderator

Compressor fridge? Yes plan to max out the roof with solar.


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