Seeking solar knowledge

[puu]

I can change a lightbulb - but have no clue about solar and the math that comes with it.

I have an aux battery (was installed with GW solenoid kid) under the driver seat and would like to keep this now charged with a solar panel, without overcharging it!

It also would be nice if it can charge my electric scooter battery, again without overcharging it! (the AC adapter reads a power output 29.4V - 1.55 A and batteries need up to 2.5 hours to be fully charged).
Since all my 86 vanagon space is so limited I have not found a small space pure sine inverter to charge my laptop and that can run also a hand blender and coffee maker.
Just wonder if it makes sense and there is a way charging the scooter directly without going over the aux battery.

Of course ideal would be a fold able solar panel I can put out in the sun with a build in inverter where I can attach a wire to the aux battery and a plug for my scooter.

Is it less pricey to put things together myself? And if YES, what do I need to do so to not overcharge my aux and scooter?

Thanks

[parker007]

need to run solar panel wires to charge controller then to battery. without controller panel drain battery when no sun or overcharge,

[E1]

How many amp hours is the battery?

Lead acid or AGM?

I mention this because when we had only one 100aH AGM battery that was down to the mid-11 volt range -- they say 11.4 volts is the "safe bottom" charge before further discharge he can harm it -- "someone" fired up our blender and killed the battery.
_________________
‘84 Westy, 2.1L with Digijet, 5.43 R+P, GT Gears
"Adding power makes you faster on the straights.
Subtracting weight makes you faster everywhere."
— Colin Chapman

[Paulbeard]

I'd skip the inverter and get a 12v charger for your laptop: cheaper anyway.

You need a charge controller for the solar panel, of which there are many choices. I went with this one. You need a solar panel. The charge controller takes care of the battery charging.

I assume you have a charger for the scooter: if so, it should manage the charging there. We need more info on how you connect it. Is there a 12V option for it? Or will you need an inverter just for that?
_________________
Currently -> Frida: 87 Tizian Red (mostly) Vanagon GL Westfalia w/ 2.0L ABA conversion
Formerly -> Steward of a 73 Super Beetle (Beater) and 67 Beetle 1300 (Little Max) both names by POs

[fxr]

You can get a USB chargeable blender - Mrs fxr has just bought one.

I think this is it:
https://www.amazon.com/dp/B06Y5X88QH
_________________
Jim Crowther
1984 1.9l EJ22 Westy Wolfsburg Edition
Vespa GTS 300

[puu]

[puu]

[Paulbeard]

[pushkick]

you might look at this morningstar for a solar charge controller they will charge your van battery and your solar battery and maybe your electric scooter

https://www.amazon.com/Morningstar-SSD-25-Sunsaver...r+sunsaver

and these dc to dc charge controllers they can work on any battery this way you dont have to buy an inverter

https://www.powerstream.com/DC-input-chargers.htm
_________________
i see said the blind man to his deaf dog
i am going to quit smoking and drinking and die a healthy man. gotta laugh
there is no deed to the planet earth
1990 vw automatic camper

[E1]

[crazyvwvanman]

His battery is just a standard car type Group 41 starting battery, so no specs given for AH.
Those are usually around 60 AH, some more, some less.
https://www.batteriesplus.com/replacement/battery/everstart/41=4/sli41

For DC input charging the scooter I don't see anything in the PowerStream product line to do 29.4v LI battery charging from a 12 volt source. Maybe I missed it.

Mark

[E1]

Thanks, Mark.

An aside... Batteries Plus is one fabulous chain, highly recommended.
_________________
‘84 Westy, 2.1L with Digijet, 5.43 R+P, GT Gears
"Adding power makes you faster on the straights.
Subtracting weight makes you faster everywhere."
— Colin Chapman