I"ll try to keep this as simple as possible.
I plan to configure a normal setup (two 100w solar panels, MPPT charger/controller, battery, 12v fuse panel, and various loads). The panels will be outputting 12v to the charger, it charges the battery, loads connected as usual. FWIW, I've been looking at a Renogy kit something like this: https://www.ebay.com/itm/283229534405
Here's the catch: I want part of my load to ONLY run while the sun is shining, and it's a very small load at that (a few amps max: two 12v->12v battery trickle chargers, and a small 12v circulating fan). Most of the controllers have a load function that would separately handle this small load, but the problem is that it seems that near everyone of them either has the load lugs designed only to run when the sun is not shining, or continuously.
Simply put, I don't want those loads to drain the batteries, which while small, could be lethal. I forgot to mention, this is going on an enclosed trailer, and I need to keep a couple of motorcycle batteries topped up while in storage.
I can't seem to find anyone who has a clear and obvious (or elegant) solution, so here's my running idea right now...
Where the panels connect to the charger (panels in series outputting 12v), I connect the coil side of a solid state relay across the panel wires (the relay is rated for 12v-36v input), and then run a load line from the fuse panel through the relay load side to feed my devices. If the controllers behave as I think they should, the relay should only close and make the load live while the panels are getting sun, and then open to kill the load at night.
Does this sound at all logical or doable? Or am I missing something altogether?
I'm not an electrical novice, but I don't yet have a controller to tinker with, and I don't want to buy one yet (especially if there is an affordable option that does what I want out-of-the-box).
Any help or thoughts would be MOST appreciated.
Zang
I plan to configure a normal setup (two 100w solar panels, MPPT charger/controller, battery, 12v fuse panel, and various loads). The panels will be outputting 12v to the charger, it charges the battery, loads connected as usual. FWIW, I've been looking at a Renogy kit something like this: https://www.ebay.com/itm/283229534405
Here's the catch: I want part of my load to ONLY run while the sun is shining, and it's a very small load at that (a few amps max: two 12v->12v battery trickle chargers, and a small 12v circulating fan). Most of the controllers have a load function that would separately handle this small load, but the problem is that it seems that near everyone of them either has the load lugs designed only to run when the sun is not shining, or continuously.
Simply put, I don't want those loads to drain the batteries, which while small, could be lethal. I forgot to mention, this is going on an enclosed trailer, and I need to keep a couple of motorcycle batteries topped up while in storage.
I can't seem to find anyone who has a clear and obvious (or elegant) solution, so here's my running idea right now...
Where the panels connect to the charger (panels in series outputting 12v), I connect the coil side of a solid state relay across the panel wires (the relay is rated for 12v-36v input), and then run a load line from the fuse panel through the relay load side to feed my devices. If the controllers behave as I think they should, the relay should only close and make the load live while the panels are getting sun, and then open to kill the load at night.
Does this sound at all logical or doable? Or am I missing something altogether?
I'm not an electrical novice, but I don't yet have a controller to tinker with, and I don't want to buy one yet (especially if there is an affordable option that does what I want out-of-the-box).
Any help or thoughts would be MOST appreciated.
Zang
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