Hi folks, me again with my DIY ideas Last night I picked up a couple of AGM (Absorbed Glass Mat) marine batteries for 2 of my cars, these cars are a hobby and don't get driven like normal cars, therefore they spend extended periods of time untouched, well this is a problem when it comes to Lead Acid batteries because they're not very good at retaining a charge for prolonged periods, also they tend to go bad if discharged all the way which happens if you let it sit plugged into the car's electrical system. Enough background, when I got home my brain started ticking lol. I already had plans to use similar batteries as backup for my reef tank, I was going to put them on a "battery tender" which is basically a trickle charger built to maintain stored batteries and wire it all up so that if main power cuts out I have 10+ hours worth of battery powered power heads, heater, etc. I wonder now, what if I powered this whole concept with a solar panel? but I have no experience whatsoever with solar panels and haven't a clue if a couple of these batteries can run a tank's low power items (Reef Angel, pumps, power heads, LED lighting) around the clock? what are your thoughts? note: I know I know before you say it, I need a kill-a-watt to measure my tank's current consumption. Kw in vs Kw out is where I need the advice of an expert as I am not familiar w/ efficiency loss in the conversions, etc.