If you drove a EV truck, with a camper top

[gator70]

Would you feel bad using a public EV charging station

 

[crazysccrmd]

Why would you feel bad?

 

[vintageracer]

Running out of VOLTAGE would make me mad!

 

[Gravelette]

I figure this is some kind of trick question but it went right over my head.

 

[gator70]

I asked the question, since I want to build a public EV charging kit for my shore power plug

 

[hemifoot]

I asked the question, since I want to build a public EV charging kit for my shore power plug

why feel bad? you're paying for the power anyway.

 

[crazysccrmd]

I asked the question, since I want to build a public EV charging kit for my shore power plug

It would be a bit of work. For a level 2 (AC) you’d either need the BMS/controller to communicate with the charger (or a kinda janky resistor setup to trick it) and a converter to step the 240v AC down to whatever DC battery you’re charging. For level 3 (DC) you’d need the BMS/controller to communicate with the charger and a way to step down the 400-800v DC to your battery pack. Maybe use a smallish salvage high voltage battery pack and associated electronics from an older Nissan Leaf to have a high capacity battery for the camper and relatively easy high speed charging.

 

[gator70]

It would be a bit of work. For a level 2 (AC) you’d either need the BMS/controller to communicate with the charger (or a kinda janky resistor setup to trick it) and a converter to step the 240v AC down to whatever DC battery you’re charging. For level 3 (DC) you’d need the BMS/controller to communicate with the charger and a way to step down the 400-800v DC to your battery pack. Maybe use a smallish salvage high voltage battery pack and associated electronics from an older Nissan Leaf to have a high capacity battery for the camper and relatively easy high speed charging.

?????

Recommended Minimal Setup (for you)​

Since you have:

• 120 V 30 A shore inlet
• Lithium system
• Don’t want to pay for RV park hookups

You can safely and affordably do this:

Step	Equipment	Purpose
1	J1772-to-NEMA 14-50 adapter (with pilot handshake)	Lets public charger energize
2	3–5 kVA step-down transformer (240 V → 120 V)	Converts voltage safely
3	Short cord NEMA 5-30 or TT-30 to your inlet	Connects to RV

 

[crazysccrmd]

?????

Recommended Minimal Setup (for you)​

Since you have:

• 120 V 30 A shore inlet
• Lithium system
• Don’t want to pay for RV park hookups

You can safely and affordably do this:

Step	Equipment	Purpose
1	J1772-to-NEMA 14-50 adapter (with pilot handshake)	Lets public charger energize
2	3–5 kVA step-down transformer (240 V → 120 V)	Converts voltage safely
3	Short cord NEMA 5-30 or TT-30 to your inlet	Connects to RV

The pilot handshake is accomplished by using resistors to trick the charger in the absence of a BMS communicating it. I suppose someone sells it premade which would be easier. I was assuming you wanted to have a J1772 or NACS plug on the camper rather than a standard TT30 plug to avoid using other adapters. If you already have a 120v system with an onboard converter then you’d only need to step the 240v to 120v rather than all the way down to DC.

 

[gator70]

I started the discussion - As other forum member suggested I would offend EV owners if I was parked at a public EV charging station toping off my batteries.