Growatt SPF 18KT DVM-MPV User Manual

12
Dry Contact Signal
There is one dry contact (3A/250VAC) available on the rear panel. It could be used to deliver signal to generator
when battery voltage reaches warning level.
1. The wiring between generator and the inverter (not all generators are the same wiring diagram as below,
please ask supplier for instruction if there’s any questions.)
Unit Status
Condition
Dry contact port:
NC & C
NO & C
Power Off
Unit is off and no output is powered.
Close
Open
Power On
Output is off and no output is powered
Close
Open
Battery not in “LI”
mode
Battery voltage <
Low DC Cut-off Voltage +2Vdc
Open
Close
Battery voltage reaches setting in 13
Close
Open
Battery in “LI” mode
Battery SOC <
Low DC Cut-off Soc +5%
Open
Close
Battery voltage reaches setting in 13
Close
Open
Electrical Performance
Inverting
Overload Capacity
1. For 100%<Load<150%, Fault (Power off) after 10 seconds.
2. For 150%<Load≤230%, Fault (Power off) after 5 seconds.
3. Under bypass mode, when AC input current > 100A, Fault (Power off) after 10 seconds
Soft Start in Inverter Mode
When the inverter is turned on, the output voltage gradually ramps up from 0VAC to rated voltage in about 1.2 sec.
This effectively reduces otherwise very high starting inrush current drawn by AC loads such as Switched Mode Power
Supplies and inductive loads. This will result in lower motor inrush current, which means less impact on the loads and
inverter.
Caution:
After the inverter is switched on, it takes a finite amount of time to self-diagnose and get ready to deliver full power.
Always switch on the load(s) after a few seconds of switching on the inverter. Avoid switching on the inverter with the
load already switched on. This may prematurely trigger the overload protection. When a load is switched on, it may
require an initial higher power surge to start. If multiple loads are being powered, they should be switched on
individually so that the inverter is not overloaded by the higher starting surge.
AC Charger
The inverter is equipped with an active PFC (power factor correction) multistage battery charger. The PFC feature is
used to control the amount of power used to charge the batteries in order to obtain a power factor as close as
possible to 1.
When AC voltage is in the range of 154~260VAC, the charging current is 100%. Once it exceeds 260VAC, it must be
restored to 250VAC before it can be charged.
The inverter/charger has a very rapid charge current available, and the max charge current can be adjusted from 10A

Growatt SPF 18KT DVM-MPV Specifications

General

Brand	Growatt
Model	SPF 18KT DVM-MPV
Category	Inverter
Language	English