OK, so that's 30W constant draw, which means 720Wh per day. If we assume we get 8 hours of full sun per day, which is reasonable if you have a fixed angle on your panels and not a sun-tracking system, that means you need to have 3x that power to go 24/7.
That's too much power for lithium batteries to make sense, go with a deep cell lead acid.
You'll want the following:
Solar panels (2160 W minumum)
Charge controller
Battery (60Ah @ 12V minimum)
Voltage regulator (12V -> 5V @ 6A)
You can get a pair of 3A buck converters for voltage regulation and run them in parallel if necessary.
If you want to be able to tolerate cloudy days you'll need more battery capacity.
If you want to tolerate winters, you'll need more solar generation capacity.
If you don't want to completely run your battery into the ground every day, you should get at least 20% more than the minimum.
I tbink that about sums it up. Deep cell marine batteries are available at your local auto store. Everything else will probably come from the internet. I'll let you do the lrice shopping.
Dr. Hax
npub16v…meqha
2026-06-01 18:43:36 UTC
in reply to nevent1q…ef6p
Author Public Key
npub16v82nr4xt62nlydtj0mtxr49r6enc5r0sl2f7cq2zwdw7q92j5gs8meqhaPublished at
2026-06-01 18:43:36 UTCEvent JSON
{
"id": "0fa7e1c4f2f02abfebf395767f200b6d478316a116bfc8cea9770d28bd309921",
"pubkey": "d30ea98ea65e953f91ab93f6b30ea51eb33c506f87d49f600a139aef00aa9511",
"created_at": 1780339416,
"kind": 1,
"tags": [
[
"alt",
"A short note: OK, so that's 30W constant draw, which means 720Wh..."
],
[
"e",
"d4a9842a8b68ca04bf1e8176f570fb3b333e1e920756cb9f61249f15d9404f85",
"wss://nostr.oxtr.dev/",
"root",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d"
],
[
"e",
"840db6a65f50c87879bd19879c40a20a28c693e578218f8cb4aeea9100a88cf6",
"wss://nostr.mom/",
"",
"d30ea98ea65e953f91ab93f6b30ea51eb33c506f87d49f600a139aef00aa9511"
],
[
"e",
"0fb253014f04176a7554582eebbfeb63b23f09ec21cc7ab9cf27f4320f4dbfe8",
"wss://top.testrelay.top/",
"reply",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d"
],
[
"p",
"d30ea98ea65e953f91ab93f6b30ea51eb33c506f87d49f600a139aef00aa9511",
"wss://nos.lol/"
],
[
"p",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d",
"wss://relay.damus.io/"
]
],
"content": "OK, so that's 30W constant draw, which means 720Wh per day. If we assume we get 8 hours of full sun per day, which is reasonable if you have a fixed angle on your panels and not a sun-tracking system, that means you need to have 3x that power to go 24/7.\n\nThat's too much power for lithium batteries to make sense, go with a deep cell lead acid.\n\nYou'll want the following:\n\nSolar panels (2160 W minumum)\nCharge controller\nBattery (60Ah @ 12V minimum)\nVoltage regulator (12V -\u003e 5V @ 6A)\n\nYou can get a pair of 3A buck converters for voltage regulation and run them in parallel if necessary.\n\nIf you want to be able to tolerate cloudy days you'll need more battery capacity.\n\nIf you want to tolerate winters, you'll need more solar generation capacity.\n\nIf you don't want to completely run your battery into the ground every day, you should get at least 20% more than the minimum.\n\nI tbink that about sums it up. Deep cell marine batteries are available at your local auto store. Everything else will probably come from the internet. I'll let you do the lrice shopping.\n",
"sig": "8b1b242d2094e02ff5e1af0f0901c23bf1d73cfa07018ddbe7106a02d1a4f1919f0210ce362f511394f44576519543e7721be9c37bde8bc45c3d5cb828355142"
}