Good Sam Club Open Roads Forum: Solar, Alternator/Starting Battery and Lithium Solution
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 > Solar, Alternator/Starting Battery and Lithium Solution

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cruz-in

Southern Maryland

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Posted: 08/16/19 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Hi Team,

I already have solar on my RV. Am in the process of adding lithium Batteries.

So I needed a new charge controller (lithium compatible) and an isolation from the vehicles alternator/starting battery (lead acid).

Stumbled across this product that does it all in one. I thought it kind of cool. Not available till 09/30/2019.

Renorgy Lithium and Solar Solution.

Thoughts?


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Lwiddis

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Posted: 08/16/19 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

Renogy's reputation is pretty good.


Winnebago 2101DS TT & 2020 Chevy Silverado 1500 LTZ Z71, 300 watts solar-parallel & MPPT, Trojan T-125s. TALL pole for flags. Prefer USFS, COE, BLM, NPS, TVA, USF&WS, state & county camps. Bicyclist! 14 year Army vet - 11B40 then 11A - (MOS 1542 & 1560)


2oldman

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Posted: 08/16/19 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

Looks ok. Renogy is good stuff.

My only possible negative is that you can get by easily without the charging from the tow vehicle. Solar runs on the road.

time2roll

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Posted: 08/16/19 04:54pm Link  |  Quote  |  Print  |  Notify Moderator

MPPT is ok but max input is 25v so limits you to 12v panels.
I prefer manually programmable charging profile.
Does not say if it boosts the alternator voltage. May have missed that.


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MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 08/16/19 06:21pm Link  |  Quote  |  Print  |  Notify Moderator

Fifty amp limit to charge batteries is not a heck of a lot. It's an attempt in the right direction but 200 amp-hours delivered in a 4-hour drive doesn't tweak my beakie. Especially if that includes solar input. A gross limit in other words. A net limit, alternator only, plus the ability of a 40 or 50 amp panel addition would be a lot better IMHO.

CA Traveler

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Posted: 08/16/19 06:34pm Link  |  Quote  |  Print  |  Notify Moderator

The unit apparently expects both battery banks to be the same type and not mixed FLA and Li. Normally the alternator will quickly charge the FLA engine battery and drop to 13.4V, what does the unit do for charging the Li at 14.4V with minimum solar due to clouds and nighttime.

My engine battery has very little usage when boondocking so I'd have no reason for solar to charge it with this unit.

In my quick review of the manual I wanted more information but perhaps I need to read again.


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BFL13

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Posted: 08/16/19 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

My MH alternator charging is around 20 amps after things settle down from about 35 amps from starting the engine and wait a bit.

However, with my big solar set, and it set to 14.x, it soon overwhelms the alternator voltage which ends up below the solar voltage by a bit, so the alternator contribution to the total amps is more like 10 amps--- not the 20 amps it would be without the solar.

In any case, the alternator charging isn't hurting anything and at best, does add some amps. If it is not sunny, there is no solar, so then the alternator charging is what you have going down the road.


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theoldwizard1

SE MI

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Posted: 08/17/19 06:53am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

MPPT is ok but max input is 25v so limits you to 12v panels.

I don't see this as much of a problem. Higher solar voltage are typically only used when the wire runs from the panels to the controller are long.
time2roll wrote:

I prefer manually programmable charging profile.

Concur !
time2roll wrote:

Does not say if it boosts the alternator voltage. May have missed that.

It does not say it specifically, but it certainly IMPLIES it !

First, unless you have a pretty old RV/tow vehicle, every vehicle built in the US has had "smart charging" for the past 10-15 years, so when installing this unit it is important to follow those instructions !

With the smart alternator setting, the charger "turns on" when the voltage is above 12.0V (cut off at 11.5V). You aren't going to be doing any Bulk or Constant charging at that low of and input voltage !

CA Traveler

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Posted: 08/17/19 07:55am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

time2roll wrote:

MPPT is ok but max input is 25v so limits you to 12v panels.

I don't see this as much of a problem. Higher solar voltage are typically only used when the wire runs from the panels to the controller are long.
24V panels provide lower cost/watt and smaller footprint/watt. Wiring is smaller/cheaper.

With serial connected panels shaded power is higher than parallel panels due to bypass diodes. And a combiner is eliminated along with the larger combiner to controller wiring.

MPPT controller is required for 12V batteries, higher controller input voltage and the panels are larger - typically 60 or more cells vs 36 for 12V panels.

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