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suprz

rhode island

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Posted: 02/18/20 01:27pm Link  |  Quote  |  Print  |  Notify Moderator

We are just looking for a small affordable solar system. This would be used to recharge a GRP 31 deep cycle battery ONLY. We just want it for lights and maybe rechargeable items. What would be good for wattage? 100 watts? 50? PWM controller? We will use the generator for all the power hogs onboard. Thx

We dont use power hungry items while boondocking, we have LED lighting, and would use propane or campfire for cooking. If we need the A/C we will be in a rv park. We dont want to get an inverter and just want solar to recharge the group 31 deep cycle. We just dont need a lot of solar or the expense of a big system

* This post was edited 02/19/20 03:30am by suprz *


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BFL13

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Posted: 02/18/20 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

suprz wrote:

We are just looking for a small affordable solar system. This would be used to recharge a GRP 31 deep cycle battery ONLY. We just want it for lights and maybe rechargeable items. What would be good for wattage? 100 watts? 50? Pcm controller? We will use the generator for all the power hogs onboard. Thx


In May at 49N sunny all day I measured an AH haul of 56AH with a 130w panel lying flat. That would bring your battery up from 50% SOC

However---
1. You will be using your battery all day too,
2. It is not sunny all day every day
3. It is not May all year
4. An RV has wheels so you will not be at the same latitude all year.

So it is a total WAG, but 200w flat might be enough most times, and you do have a generator for recharging via converter if not enough sun at times.

You can use a PWM controller with the 200w. An MPPT will only do a little better (maybe!) and will likely cost more.


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naturist

Lynchburg, VA

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Posted: 02/18/20 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

Mobile-solarpower.com is a wealth of info on solar stuff.

100 watts would work with an MPPT controller. Better would be 200 watts, for those rainy days.





Lwiddis

Lone Pine, CA

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Posted: 02/18/20 05:01pm Link  |  Quote  |  Print  |  Notify Moderator

Your energy survey indicates you need..batteries? Solar panels? Controller?

Lights? LED, incandescent, florescent? PCM controller? Must be a new type.

This might work but you’ve provided no numbers. https://www.windynation.com/Polycrystalline-Solar-Kits/Windy-Nation-Inc/WindyNation-200-Watt-12-24V-Polycrystalline-Solar-Panel-Complete-Kit-with-LCD-Solar-Controller-RV-Boat-Of/-/631?p=YzE9NDY=


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)


EV2

South Dakota/Arizona

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Posted: 02/18/20 05:14pm Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

suprz wrote:

We are just looking for a small affordable solar system. This would be used to recharge a GRP 31 deep cycle battery ONLY. We just want it for lights and maybe rechargeable items. What would be good for wattage? 100 watts? 50? Pcm controller? We will use the generator for all the power hogs onboard. Thx


In May at 49N sunny all day I measured an AH haul of 56AH with a 130w panel lying flat. That would bring your battery up from 50% SOC

However---
1. You will be using your battery all day too,
2. It is not sunny all day every day
3. It is not May all year
4. An RV has wheels so you will not be at the same latitude all year.

So it is a total WAG, but 200w flat might be enough most times, and you do have a generator for recharging via converter if not enough sun at times.

You can use a PWM controller with the 200w. An MPPT will only do a little better (maybe!) and will likely cost more.


Good answer. We spent 4 days at Lake Havasu and had minimal gen time for microwave. Batteries recharged each day for lights, water pump, furnace fan, and a couple of hours of satellite receiver and television. Batteries were recharged every day.

Boon Docker

Mountain Foothills of Southern Alberta

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Posted: 02/18/20 05:32pm Link  |  Quote  |  Print  |  Notify Moderator

I run 200 watts of solar with MPPT controller and my batteries (A pair of GC2's) are always fully charged by early to mid afternoon.
I would go with 200 watts if I were you.

dieseltruckdriver

Black Hills of SD

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Posted: 02/18/20 05:51pm Link  |  Quote  |  Print  |  Notify Moderator

In the summer and in full sun, 200 watts is enough for us. Later (October) in the year and cloudy days, it wasn't. I currently have 300 watts on the roof, and have 200 more to add this spring. I am using a Renogy Wanderer 30 amp PWM charger, it cost about 30 bucks. For panels, I am using HQST 100 watt panels.
I installed a Victron pure sine wave inverter for the tv, since that is all we use that isn't 12 volts or propane powered.


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naturist

Lynchburg, VA

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Posted: 02/18/20 08:35pm Link  |  Quote  |  Print  |  Notify Moderator

Of course, “more is better.” More solar panels, for overcast skies/shady campsites, and hey, battery is fully charged by lunchtime (sunny day), so wouldn’t it be great to have more battery, and next thing you know there’s 2,000 watts of panels feeding 600 amp hours of batteries so you can run a small AC overnight . . . .

pianotuna

Regina, SK, Canada

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Posted: 02/18/20 09:07pm Link  |  Quote  |  Print  |  Notify Moderator

600 amp-hours of 12 volt batteries is not going to run even the smallest of air conditioners for very long.

Do an energy audit. From that size the battery bank. Then add solar charging.


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.

Gulfcoast

Alabama

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Posted: 02/19/20 02:00am Link  |  Quote  |  Print  |  Notify Moderator

I don't have solar yet, but I don't see how 200-watts would be enough in the winter to run my furnace (I like it warm), lights, pump, tv, laptop and internet booster.

I now use my Champion inverter generator with golf cart batteries.

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