I dunno why, but I still like this place.
Eight solar panels, not enough information. Three batteries, not enough information.
H2 in the house? Put batteries in a box and vent the high side out and the low side in, that's the way it is done and has been done for 20 years. If you feel unsafe, vent the thing with a fan. Plenty of online retailers looking to prey upon H2 fears with a fan ventilated enclosure.
Find three verified news stories of people that have blown up their houses because of H2 in solar power installations, with the venting scheme I have described (no fan), and I will send you this beautiful, dark bottle containing 1.75L of Evan Williams to enjoy for yourself at no cost, courtesy of me, including freight.
Volvo Farmer
May you always have success in your quest to irritate those who you despise.
-Ben Goode