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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Solar Charge Controller question

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dieseltruckdriver

Black Hills of SD

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Posted: 03/21/20 10:39am Link  |  Quote  |  Print  |  Notify Moderator

Twistedlarch wrote:

I'm confused with what I need, PWT or MPPT?


Then watch THIS video.

My PWM works perfectly, but this is part of the reason I most likely will be changing. That and I want to get to at least 600 watts on the roof.


2000 F-250 7.3 Powerstroke
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pianotuna

Regina, SK, Canada

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Posted: 03/21/20 10:53am Link  |  Quote  |  Print  |  Notify Moderator

If you decide on pwm look at the Grape solar controller available from Home Depot.

https://www.amazon.ca/Grape-Solar-GS-PWM........40BT-Controller-Monitoring/dp/B01FFNNUSK

or

https://www.homedepot.com/p/Grape-Solar-........rge-Controller-GS-PWM-COMET-40/305498558

Be sure to get and use the battery temperature sensor.


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.

Lwiddis

Kern County, CA

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Posted: 03/21/20 01:29pm Link  |  Quote  |  Print  |  Notify Moderator

The Rich Solar unit is limited to 10 gauge wire max. That’s too small.

More charging power from an MPPT. Think cold, cloudy, wintertime, far from the Equator...and only 200 solar watts.


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)


ScottG

Bothell Wa.

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Posted: 03/21/20 01:33pm Link  |  Quote  |  Print  |  Notify Moderator

Great video and very helpful but I got a little lost. Can most of these switch between lead acid and LI if I later choose to upgrade?


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2oldman

AZ

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Posted: 03/21/20 02:51pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

Can most of these switch between lead acid and LI if I later choose to upgrade?
Only if they have user-defined voltage setpoints, including the ability to skip absorb. Cheaper ones usually don't.

What you may be able to get away with using Li's is that they don't care if they don't get fully charged, which may happen if you use the acid profile.

ScottG

Bothell Wa.

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Posted: 03/21/20 03:56pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

ScottG wrote:

Can most of these switch between lead acid and LI if I later choose to upgrade?
Only if they have user-defined voltage setpoints, including the ability to skip absorb. Cheaper ones usually don't.

What you may be able to get away with using Li's is that they don't care if they don't get fully charged, which may happen if you use the acid profile.


Good to know. If or when I switch over to LI, my solar system will be very small (if I even upgrade it) so I could probably get by with what I have.

ppine

Northern Nevada

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Posted: 03/21/20 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

MPPT all the way. Get enough capacity in your controller in case you want to expand your system. I like a 40 amp unit.

I like Renogy and some other companies.
Windy Nation was nothing but trouble.

bpounds

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Posted: 03/22/20 10:33am Link  |  Quote  |  Print  |  Notify Moderator

I've been very happy with my Epever system. Search that term on Amazon.

It will stretch your $100 budget, but worth the extra money IMO.

I would go with a 40a, even though the 20 or 30a would suffice for your 200w panel array. Unless you have zero chance of adding panels later, for example, no roof space left. In which case, go with the smaller rating CC.

I would also recommend the kit that includes the MT50 monitor that you can place inside the coach. The kit also gets you the temp probe.

Money spent on a PWM is money poorly saved IMO.


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2011 Keystone Cougar 278RKSWE Fiver


Boon Docker

Mountain Foothills of Southern Alberta

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Posted: 03/22/20 11:57am Link  |  Quote  |  Print  |  Notify Moderator

X2 on the Epever solar controller, excellent unit.

dieseltruckdriver

Black Hills of SD

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Posted: 03/22/20 03:41pm Link  |  Quote  |  Print  |  Notify Moderator

I am leaning towards the EPEver controller also, but may go with the Victron for a bunch more money just because I am so darn happy with my battery monitor.
The reason I am upgrading is I am already close to maxing out my Renogy Wanderer, and I have 200 more watts sitting in the garage waiting to be installed, and I really didn't plan on going this big to begin with.

It gets addicting being able to do everything we normally do without having to start the generator.

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