Solar inverters

MesPal SP-3K5-EP1

Name: MesPal SP-3K5-EP1
Brand: MesPal

3.5 kW off-grid solar inverter

A single-phase SmartInver for solar generation and backup. Supports lithium and lead-acid batteries, battery-free operation and parallel expansion.

Rated output power3.5 kW

Maximum PV power4000 W

Nominal battery voltage48 / 51.2 V

Ingress protectionIP21

Request a quote MesPal 2026 catalogue (PDF)

MesPal

Application advantages

Factory-stated use cases and system strengths from the product brochure.

Battery-free operation

Can operate without a battery under a suitable power configuration.

Parallel expansion

Up to nine inverters in a parallel system.

BMS communication

CAN and RS485 for a compatible battery.

Backup supply

Utility input and solar generation supply local loads.

PV up to 500 V DC

MPPT tracking range 100–450 V DC.

Low-voltage battery

Supports 48 V lead-acid and 51.2 V lithium batteries.

MesPal

Technical specifications

Key factory specifications from the manufacturer’s brochure.

Inverter and AC output

Rated output power	3500 W
Rated apparent power	3500 VA
AC output voltage	220 / 230 / 240 V AC ±5%
Rated frequency	50 / 60 Hz ±1%
Surge power	7000 VA
Maximum efficiency	93 %
Overload capability	≥150% for 5 s; 110–150% for 10 s
Transfer time	10 ms (UPS); 20 ms (Appliances)
Operating modes	Off-grid with utility input; no grid export
Parallel operation	Up to 9 units

AC input and bypass

Nominal voltage	230 V AC
Grid voltage range	170–280 V (UPS); 90–280 V (Appliances)
AC frequency range	40–65 Hz
Maximum bypass current	40 A
Maximum AC charging current	60 A

Battery system

Nominal battery voltage	48 V DC (lead-acid); 51.2 V DC (lithium)
Combined AC + PV charging current	60 A
Maximum discharging current	85 A

Solar PV input

Maximum PV voltage	500 V DC
Maximum PV power	4000 W
MPPT voltage range	100–450 V DC
Maximum PV input current	16 A
Maximum PV charging current	60 A

Construction and operation

Ingress protection	IP21
Dimensions	420 × 325 × 138 mm
Net weight	10.9 kg
Noise level	≤55 dB
Relative humidity	5–95%, non-condensing
Storage temperature	−15…+60 °C
Operating temperature	−10…+50 °C
Installation altitude	Up to 4000 m; derating above 3000 m
Communication interfaces	RS485 / CAN / dry contact
Cooling	Intelligent air cooling

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Sourcing and delivery under one contract

The inverter supplies local loads from PV, battery or AC. This is an off-grid model with utility input, not a grid-export inverter. Battery settings, source priority and parallel configuration must be agreed during design. Wi-Fi requires a compatible external adapter.

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+38 (066) 456 14 52 contact@vezemo.com.ua