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Open Roads Forum  >  Tech Issues

 > Adding A Portable Solar Panel

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BMCM

Santa Clarita, CA

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Posted: 01/14/12 10:42pm Link  |  Print  |  Notify Moderator

Have a volt meter.. should have a sunny day tomorrow.
rw


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Almot

out there

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Posted: 01/15/12 12:33pm Link  |  Print  |  Notify Moderator

I like the idea of 2 panels in parallel via one controller. With 2 assumptions that I'm 99% positive of - that both controllers are PWM and installed 100W panel has working voltage 17 or 20 - minor difference in working voltages won't matter for one controller. His portable 50W panel comes with a huge 21A controller, so it will be able to handle both panels.

BMCM

Santa Clarita, CA

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Posted: 01/15/12 03:00pm Link  |  Print  |  Notify Moderator

Couldn't see any specs on the back of my panel.

My panel measured 20v at the the connection from the panel, the 50w panel measured 20.8v.
rw

pianotuna

Regina, SK, Canada

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Posted: 01/15/12 06:03pm Link  |  Print  |  Notify Moderator

Hi,

That is as close as you are likely to find. You could in theory introduce voltage drop on the 50 watt panel to reduce the difference.


Regards, Don
Full Time in a Kustom Koach Class C 28'5", 256 watts Unisolar, 875 amp hours in two battery banks 12 volt batteries, Magnum 3000 watt PSW inverter.

BFL13

Victoria, BC

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Posted: 01/15/12 05:50pm Link  |  Print  |  Notify Moderator

They are close enough to use together, both being "12v" panels that are approx 17v with 20/21v open circuit. You can clamp the one controller to the battery bank while the installed one is still connected and they will add their amps.

After the batteries are mostly charged up, one controller may stop adding because its high voltage set-point might be a little less than the other's, but by then the batteries will be accepting few amps and the one controller still going can do it all anyway.

Try it out. It won't break anything. You will need an ammeter to see the "action" as it develops.


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BMCM

Santa Clarita, CA

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Posted: 01/15/12 08:31pm Link  |  Print  |  Notify Moderator

Heading out for a week or so of boon docking.. the extra 50 watt panel should help.
Thanks to all for your input..
rw

2oldman

Sprague Lake

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Posted: 01/15/12 08:34pm Link  |  Print  |  Notify Moderator

BMCM wrote:

Heading out for a week or so of boon docking.. the extra 50 watt panel should help.
a little.. don't expect much.

BMCM

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Posted: 01/16/12 10:17pm Link  |  Print  |  Notify Moderator

2oldman wrote:

BMCM wrote:

Heading out for a week or so of boon docking.. the extra 50 watt panel should help.
a little.. don't expect much.


never do.....

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