I'm new to solar but wanted to take a shot at setting up a system to run a small pond I have in my yard. The pond uses a 900GPH pump 120v 60w. It also has an air pump for a filter module 120v 15w.
I'm considering using 2 Trojan 6V batteries (in a 12v configuration) rated at 390ah each. According to my math, that gets me about 100 hours of run time with fully charged batteries (60w +15w+ (some % of inverter loss = 100w ?)
Can I use a small grid tied battery charger to continuously top off the batteries which would then run the inverter and pumps?
From here, I wanted to add solar panels until I could untie the system. This would make it easier for me to purchase the panels over time.
Are there any risks to this setup? I've looked at some Magnum MMS1012G inverters that charge via grid power but they seem very expensive ($1,000). Isn't it cheaper to just use a 5amp charger to top off?
lastly, what solar panels would you suggest?